In December 2018, Buck's Private Member's Bill received Royal Assent as the Homes (Fitness for Human Habitation) Act, coming into force on 20 March 2019. If a landlord failed to let and maintain a property that was fit for human habitation, the Bill would give tenants the right to take action in the courts. The Bill received cross-party support.[5]

Buck is concerned that homeless Londoners are forced to move out of London, and stated, "Losing your home is a deeply traumatic event and then being offered accommodation miles away from your community, your work, your children’s school and your care responsibilities compounds all that trauma. People are struggling against the most appalling odds to hold their own lives together and above all to hold their kids’ lives together."[2]